On 23.03.15 05:07, Mark Wendt wrote:
> Slightly off-tangent here. There's an explanation line in the second
> paragraph of 1.1 Basic Concepts:
>
> "If you are a logic kinda guy the line says If B0 is off AND either B1 OR
> Q0 is on then coil Q0 is on."
>
> Shouldn't that be:
>
> "If you are a logic kinda guy the line says If B0 is "on" AND either B1 OR
> Q0 is on then coil Q0 is on."
>
> According to the paragraph above this, B0 is normally closed. With B0
> "off", or open, and either B1 or Q0 is on, then coil Q0 should be off.
Though I am "a logic kinda guy", not a ladder wielder, I interpret the
"off" to refer to the B0 coil, not one of its contacts, which may be NC
or NO. That makes a NC contact an inverted output which is a 1 when the
input is 0.
Does that realign the planets?
Erik
--
The ultimate barrier is one's viewpoint.
- Terry Pratchett, "The Dark Side of the Sun"
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